Pneumatic tamper



lowered or depressed position, as shown in Figs. 1 and 2, the head 18, at the upper end thereof, has position in a horizontal plane above the upper end of the side passage 14, while the valve-head 15 is depressed below and uncovers a seat 19 that is located lat the entrace to the upper reduced portion.

A spring 2O is coiled about the lower guide stem 16 and, when the valve is depressed and in the open position, this spring is compressed between the valve-head 15, and the plug 12, but said spring is sufficiently strong to lift the valve and its actuating devices when pressure on the latter is removed, as will now be explained.-

The head 10, has'a vertical stem 'into which the reduced portion 13 of the valve-k chamber projects and theupper end of this reduced portion opens into the bottom side of a cross-slot 21 which latter extends horizontally across said stem, as best shown in Fig. 2 of the drawing. HoriZontally-projecting lugs 22, are provided on the stem at opposite sides of thel slot so that an actuating lever 23, may extend through the slot andA have one end thereof pivoted by means of a cross-pin'31 that extends through said end and also through the lugs 22.

'Ihe lower edge of this actuating lever 23, projects over and seats upon the upper end of valve-stem head 18 so that by depressing or raising the said lever a corresponding downward or upward movement may be imparted to the valve structure.

The downward movement ofthe lever and valve structure is obviously7 effected by manually compressing the spring 2() and the upward movement isautomatically effected by air and spring-pressure when manual pressure on the lever is released,-the spring, as heretofore recited,` being` rsuliiciently strong to lift both the .valve structure and the lever.

To facilitate the operation the lever has a free end 24. which in the present instance is broadened and slotted so it may be readily f grasped by the hand of the operator and pulled upwardly to `seat' the valve or pushed downwardly to unseat said valve. l By referencevto Fig. 1 of the drawing it will be seen that a 'fluid-pressure supply port 25, is provided in the head 10, which opens into the chamber 11, beneath the valveseat 19, so that when the valve-head 15, is pressedldown the supply port and chamber 11` will be in communication with the passages 14: and 9 that lead to thel cylinder.

It is to be understood that any upward pull on lever-end 24 or the mere release of said end by the removal of the hand ,of the operator will at once permit the yvalve to move .upwardly and engage the seat 19, thereby automaticallycutting olf the fluidpressureto the cylinderandstopping V,the operation of the piston 8,

At times it may be desirable to cause the piston to continue operation while the hand of the operator is removed from the free end 24 of the lever and to enable this to be doney I provide a sliding lock device26 on the lever with a lug27 thereon so that by moving the lock on the lever toward the slot 21, the lug 27, will become interposed between the upper edge of said slot and the upper side of the lever and thus hold the lever and valve down against the action of the spring and thereby keep the valve 15, unseated. p

By reference to Figs. 2 and 3 of the drawing it will be noted that the lever 23, is provided with a. cross-passage y28 in which a spring-pressed ball 29, is confined so as to slightly project at one side and form a yielding stop to engage al vertical edge of the sliding lock and hold the same in either the i" unlocked or the locked position.

The eXtreme upper endof the head stem is provided with a suitable handle 30, which may be grasped by the operator during the handling, orthe operation of the tool.

The lower end of the cylinder or barrel 6 has a central chamber 32 therein with guidebushing 33, in the upper end thereof and at the entrance to said chamber there is vprovided a split or two-part bushing 34, which has a stop-shoulder 35, around its exterior to limit its inward movement into said ch amber 32. The rela-tivel positions of these two bushings 33 and 34 are such as to leave a space between their adjacent ends in the chamber 32. so that the tool 36 which Areceives the blow of the piston 8, p may be guided by said bushings and may be limited or vrestricted in its longitudinal movementL by means of an enlargement 37, thereon which may travel between said two bushings.

coiled spring 38 encircles the outer circumference of the lower barrel-end which is provided with a. spiral groove or thread to receive it and the lower endet this spring coils about the split bushing 34, beneath the shoulder 35 -thereon so as to yieldingly hold the bushing inplace but allow the saine to.

yield longitudinally in case the enlargement 37 on the tool should makea long enough stroke to strike the inner end of the split bushing.

Having described my invention, I claim,- n

1. In a fluid actuated tool,.thecombina tion of a cylinder; a reciprocating piston mounted therein; a working tool held in one end of the cylinder so as to be acted upon kby the piston; a valve device controlling the passage of fluid to the cylinder; and a pair of handles for holding and positioning the tool, one of said handles being fixed with reference to the cylinder and the other of said handles being pivotallyv mountedand movable with respect tothe cylinder,

said latter handle when moved in the `feeding direction of the tool opening the valve to permit passage of fluid to the cylinder.

2. In a fluid actuated tool, the combination of a cylinder; a piston mounted for reciprocation therein; a Working tool held in one end of the cylinder so as to be acted upon by the piston; a head attached to the opposite end of said cylinder; a valve de f vice in said head to control the passage ot fluid to the cylinder; and a pair of handles for holding and positioning the tool7 one of said handles beingl fixed upon the upper portion ot the head, and the other of said handles being movable With respect to the head, said latter `handle when in one position opening' the valve to permit passage of fluid to the cylinder.

A fluid-actuated tool comprising a cylinder containing a reciprocating piston, a Working tool held in one end of the cylinder so as to be acted upon by the piston, a head at the opposite end of the cylinder said head being provided With a stem With a cross-slot thereiin-said head Yalso having a valve-chamber which opens into said crossslot, a valve in said valve-chamber to control the passage of fluid to the cylinder and a lever movable in said stem-slot and engaging the valve said lever also serving as a handle for the tamper-tool.

1l. A fluid-actuated tool comprising a cylinder containing a reciprocating` piston, a working tool held in one end of the cylinder so as to be acted upon by thepiston, a head at the upper end of the cylinder and provided With a stem with a rigid handle thereon, a valve device operating in the head for controlling` the passage of fluid to the cylinder, a combined valve-actuating lever and handle carried by the stem for opening the valve by pressure on the lever while the tool is held to its Work by the handles and meansv for closing the valve when the pressure on the lever is relieved.

5. A fluid-actuated tool comprising a cylinder containing a reciprocating piston7 a Working tool held in the lower end of the cylinder so as to be acted vupon by the piston, a head having a steuer-said head being located at the upper end of the cylinder and provided With a stem with] a rigid handle thereon, a valve in the head for controlling` the passage of fluid to the cylinder and a movable handle also mounted on the stem and located between the rigid handle and cylinder for operating the valve7 *said handles enabling the operator to readily position the tool.

6. A fluid-actuated tool comprising a cylinder containing` a reciprocating.piston, a working tool held in 'one end of the cylinder so as to be acted upon by the piston,

a head attached to the cylinder adjacent tov the opposite end said head having a pro jecting stem with a rigid handle thereon, a valve device in said head to control the passage of fluid to the cylinder, a movable handle carried by the stem for actuating the valve and also serving along With the rigid handle, to press the tool to its Work, and means for locking the movable handle in the position to keep the valve open.

7. In a power-actuated tool, the combination of a body; a tool carried thereby; power-actuated means located vWithin the body to actuate the tool; controlling means for said power-actuated means; and a pair of handles. for holding and positioning the body and tool, one of said handles being fixed with reference to the body at upper portion of the same and the other of said handles extending laterally from the body and being movable with respect to the body, said latter handle when in one position rendering said power controlling means effective to put the power-actuated means into operation.

In testimony whereof I afiix my signature.

SAMUEL OLDHAM. 

